Index for recording instruments.



PATENTED DEG. 3, 1907'.

0. E. VAWTBR, JR. INDEX FOR RECORDING INSTRUMENTS APPLICATION FILED. AUG. 2.4, 190&.

3 mnn foe aar w dz CHARLES E. VAWTER, JR, OF BLACKSBURG, VIRGINIA.

INDEX FOR RECORDING INSTRUMENTS.

Specification of Letters Patent.

Patented Dec. 3, 1907.

Application filed August 24. 1906- Berial No. 331.895.

To all whom it may comem:

Be it knownthat 1, CHARLES E. VAWTER, J r., a citizen of the United States, residing at Blacksburg, in the county of Montgomery and State of Virginia, have invented certain new and useful Improvements in Indexes for Recording Instruments, of which the following is a specification.

This invention relates more articularly to improvements in movable in exes for recording instruments, such for example as the kind forming the subject of U. S. Letters Patent N 0. 807,518, granted to me December 19, 1905. In instruments of this character the record is produced upon a moving record sheet by means of a marking device carried upon an index arm pivoted at or near one end so that the marking device may be moved angularly across the record sheet, the said marking device bein normally out of contact with the record s eet and is drawn into engagement therewith periodically.

The Oh ect ofthe present invention is to increase t e efficiency of this class of instruments by providing an index which is more dead beat or aperiodic, having a smaller moment of inertia, quicker in action and more sensitive than any with which I am acquainted.

One form of my invention is shown in the accompanying drawings wherein;

Figure 1, represents the said device in side elevation; Fig. 2, a top plan view thereof;

and Fig. 3, a detail sectional view taken along the line 3-3 of Fig. 1.

Referring to the accompanyin drawings, 1 represents the index arm whic is preferabl of some li ht metal not possessing a high degree of exibility; 2 a pivot spindle which passes transversely through and is made fast to the body of the index arm, by friction between the two or otherwise, near one end thereof, the said index arm being thickened at that portion to accommodate the s indle, as shown in Fig. 3. The pivot spin 1e 2 is mounted in pivot bearings 3 and 4 in a circular yoke 5, formed on a pivot spindle 6, which may be mounted in any suitable pivot bearings 7. The bearing 4, as will be seen, may be in the form of an adjustable screw. Extending rearwardly from one side of this spindle 6 is an arm'8 to which is secured a spiral spring 9, which latter is in turn secured at its upper end -to one end of the index arm. This arm 8 also carries an adjusting screw 10, which, engaging a soft rubber buffer '11 on the lower side of the rearward extension of the index arm, limits the downward movement of said extension. The arm 8 is also provided with a screw threaded extension 12 upon which is mounted for adjustment a counter-balance wei ht 13.

T e free end of the index arm has attached thereto a small soft iron armature 14 for attraction by a record producing magnet 15, such, for example, as shown in the above mentioned patent. Upon the same end of the index arm is mounted a small metal collar 16. Extending through this collar, the end of the index arm and the armature 14, is an ink receptacle 17 having. a substantially conical bottom 18 through which passes an outlet 19 for the passage of the ink.

20 represents the record sheet. The marking. device is pulled into engagement with the record strip by the magnet 15, against the tension of the spring 9, and is instantaneously withdrawn by said spring from the record sheet upon the release of the armature 14, by the magnet. index arm is depended upon to allow the marking device to be drawn to the record sheet and to remove-the said device from said sheet, there occurs a continued springing action of the ,index arm, which materially interferes with the accuracy of the instrument. This arrangement of s ring with soft rubber buffer 11 deadens t springing action. With the present arrangement, the movement of the recording device becomes practically dead beat, when periodically drawn to engagethe record sheet. The arrangement shown also ermits the recording end of the index to yie d more readily to the attractive force of the magnet, thereby rendering the instrument more sensitive.

The counter balance weight 13-equalizes the wear on the pivots of the spindle 6, and

makes the index in equilibrium in any position.

The index herein shown and described'is only one of several specific forms which my invention may assume without departing from the spirit thereof.

Having thus described a form of my invention, what ,I claim is:

1. A support mounted for angular movement upon an axis, an index arm fulcrumed on said support substantially in the line of said axis for angular movement in a direction at right angles to the axial movement of said If the resiliency of the support, and recording means carried'by said arm.

2. A support mounted for angular movement on an axis but rigid against movement in a direction at right angles to said axis, an index arm pivoted at one point only on said sup ort for movement in a direction at right ang es to the axial movement of said support, resisting means to oppose the said movement of said arm in one dlrection and assist it in the opposite direction; and recording means carried by said arm at its free end.

3. Asupport mounted for angular movement upon an axis, an index arm fulcrulned in said support for angular movement in a direction substantially at right angles to the axial movement of said support, cushionin means to limit the angular movement of sai arm in its fulcrum in one direction, resisting means acting against said movement in the opposite direction, and recording-means carned by said arm near one end, the said fulcrum of said arm being between said recording means and, the point where said resisting means acts onsaid arm.

4. A s indle pivoted for angular movement on-its longitudinal axis, an index arm pivotally supported near one end by said foo spindle for angular movement in a direction substantially. at right angles to, the axial movement of said spindle, a proj ectionmovable with said spindle, a stop carried by said projection to limit the. movement of said index arm in one direction, a springeonnected to'said rojection and to said index arm near one en thereof, and recording means carried by said arm near its otherend.

5. A supporting yoke mounted for an lar movement on a diametrical axis, an ind d x arm pivotally mounted near one end in said yoke for angular movement in a direction substantially at right angles to the axial movement of said yoke, an arm movable with said yoke, a stop carried by said arm to limit the movement of said indexarm in one di- ;rection, a spring'conneeted to said stop-carrymg arm and to said index arm near one end' thereof to oppose the movementof said index on its' pivot in one direction, and recording means carried by said index arm near its other end. i

6. A supporting yoke, pivot spindles extending from diametricall opposite sides of said yoke to supportsai yoke for angular movement, an index arm pivotally mounted near one end in said yoke for angular movement in a direction substantiall at right angles to the angular movement 0 said yoke on 1ts pivots, an armextending outward from said yoke and movable therewith,a stop carried by said arm-to limitthe movement of said index arm in one direction, a spring con nected to said stop-carrying arm and to said index arm near one end thereof to oppose the angular movement of said index arm on its carrying arm, and recording means carried by said index arm near its other end,

7. A pivotal support, an index arm ivotally mounted in said sufpport in the hue of the pivotal axis thereo or, angular movement ina direction-substantially at right angles to the axial'movem'ent of said sup ort, a stop to limit the angular movement 0 said arm'on its pivot in one direction, a yielding body on said index arm to engage said stop,

and yielding means acting against the 'p1votal movement of said arm in the opposite direction.

8. A supportinggoke. mounted for an lar movement on a iametrical axis, an in ex arm pivotally mountednear one endin said yoke for angular movement in a direction substantially at right angles to't'he axial movement of said yoke, an arm movable withsaid yoke, a stop-carried by said armto limit the movement of said index arm in one direction, .a resilient buffer carried by said index-arm to engage said stop, a spring connected to said stop-carrying arm and to said.

index arm near one end thereof to oppose the movement of said index on its pivot in one direction, and recording means carried by said index arm near its other end. I

9. A supporting yoke, pivot spindles extending from diametricall' opposlte sides 'of said yoke to support sai yoke for angular movement, an in ex arm pivotally mounted near one end in said yoke for angular movement in a direction substantiall at right angles to the angular movement 0 said yokeon its ivots, an arm extending outward from sai yoke'and movable therewith, a stop car ried by said arm to limit the movement of said index arm in one direction, a soft rubber buffer carried by said index arm to engage said stop, a spring connected to said stopcarrying arm and to said index arm near one end thereof to oppose the angular movement of said index arm on its pivots in one direction, an adjustable counter-balance weight mounted on said stop-carrying arm, and recording means carried by said index arm near its other end.

10. The combination with a support .mount'ed for angular movement upon an axis. of an mdex arm plvotally mounted onsaid support, a spring acting against the an gular movement of said arm on said pivot in one d1rect1on,' and recording means carried by said arm, the pivot of said arm being between the said recording means land the point where said spring acts on saidarm.

11. The comb nation with a support mounted for angular movement upon an axis, of an index arm pivotally mounted on said support, a spring acting against the angular movement of said arm on said pivot in one direction, recording means carried by said arm on the opposite side of said pivot from the point where'said spring acts on said arm, and a weight on the opposite side-of said pivot and said axis from said recordi means to counterbalance the weight of the arm and recordi means.

12. The combination with a support m0unted for angular movement upon an axis, of an index arm pivotally mounted on said support, means acting against the an gular movement of said arm on said pivot in one direction and with it in the opposite direction to restore said arm to its normal posltlon, and recor means carried by said arm; the pivot of sai arm beingbetween the 15 CHARLES E. VAWTER JB. 7

Witnesses Y W. A. P Moncmm, J. E. Vaw'rnn. 

